I have had one strip on me, and a few friends using them have had a couple that dont centre. out of a total of about 20 odd servos between us, there are about 8 that give problems. Seemed like a good servo, good speed and a good price, but I am a little disapointed that out of about 4 of us that have them, all of us have had problems with them, and not being in the states, the postage on sending them back to Horizon is worth more than the servo.